1. Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Material Sciences and Chemical Engineering Harbin Engineering University Harbin 150001 P. R. China
2. Department of Ultrasound The First Affiliated Hospital of Harbin Medical University Harbin 150001 P. R. China
3. Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
4. Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore